Convert Java ArrayList to String Array with Examples

Convert Java ArrayList to String Array with Examples

1). Manual way of conversion using ArrayList get() method

In the manual way we need to do the following steps: a) First obtain the ArrayList size using size() method
b) Fetched each element of the list using get() method
c) Assigned each element to corresponding array element using assignment = operator.

  
import java.util.ArrayList;
import java.util.Arrays;

public class ArrayListTOArray {
  
public static void main(String[] args) {

		ArrayList <String> monthList = new ArrayList <String> ();

		monthList.add("January");
		monthList.add("February");
		monthList.add("March");
		monthList.add("April");
		monthList.add("May");
		monthList.add("June");
		monthList.add("July");
		monthList.add("August");
		monthList.add("September");
		monthList.add("October");
		monthList.add("November");
		monthList.add("December");

		String monthArray[] = new String[monthList.size()];

		for (int i = 0; i < monthList.size(); i++) {
			monthArray[i] = monthList.get(i);
		}

		for (String month: monthArray) {
			System.out.println(month);
		}
	}
}

2). Using Java 8 stream

Using Java 8 or later, we can use stream() and collector to get the string array from arraylist

  
import java.util.ArrayList;
import java.util.Arrays;

public class ArrayListExample {
	public static void main(String[] args) {
  
       ArrayList <String> monthList = new ArrayList <String> ();

		monthList.add("January");
		monthList.add("February");
		monthList.add("March");
		monthList.add("April");
		monthList.add("May");
		monthList.add("June");
		monthList.add("July");
		monthList.add("August");
		monthList.add("September");
		monthList.add("October");
		monthList.add("November");
		monthList.add("December");

		String[] monthArray = monthList.stream().toArray(String[]::new);
     	System.out.println("The month array is: ");
		System.out.println(Arrays.toString(monthArray));
	}
}

3) Using toArray() method

The arrayList has a metod toArray() which can convert the ArrayList of string type to the array of Strings.

    
import java.util.ArrayList;
import java.util.Arrays;

public class ArrayListExample {
	public static void main(String[] args) {

		ArrayList <String> monthList = new ArrayList <String> ();

		monthList.add("January");
		monthList.add("February");
		monthList.add("March");
		monthList.add("April");
		monthList.add("May");
		monthList.add("June");
		monthList.add("July");
		monthList.add("August");
		monthList.add("September");
		monthList.add("October");
		monthList.add("November");
		monthList.add("December");

		String[] monthArray = monthList.toArray(new String[monthList.size()]);
		System.out.println("The month array is: ");
		System.out.println(Arrays.toString(monthArray));
	}
}

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